I get a bit more noise now after replacing with the Nissens as well. I thought at first I had too much refrigerant system but no. The quality 'looked' really good. The noise is more when there is less heat load so maybe they have a different calibration or there is something different with the variable displacement that pumps too much or doesn't let the volume go down far enough when not needed ?? I have 2 or 3 seasons on it and has worked fine other than the noise.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)